OK, let's work through this together. We're starting with 715 and we're going to multiply it by 172, which means we add 715 to itself 172 times.
Step 1: 0 + 715 = 715
Step 2: 715 + 715 = 1430
Step 3: 1430 + 715 = 2145
Step 4: 2145 + 715 = 2860
Step 5: 2860 + 715 = 3575
Step 6: 3575 + 715 = 4290
Step 7: 4290 + 715 = 5005
Step 8: 5005 + 715 = 5720
Step 9: 5720 + 715 = 6435
Step 10: 6435 + 715 = 7150
Step 11: 7150 + 715 = 7865
Step 12: 7865 + 715 = 8580
Step 13: 8580 + 715 = 9295
Step 14: 9295 + 715 = 10010
Step 15: 10010 + 715 = 10725
Step 16: 10725 + 715 = 11440
Step 17: 11440 + 715 = 12155
Step 18: 12155 + 715 = 12870
Step 19: 12870 + 715 = 13585
Step 20: 13585 + 715 = 14300
Step 21: 14300 + 715 = 15015
Step 22: 15015 + 715 = 15730
Step 23: 15730 + 715 = 16445
Step 24: 16445 + 715 = 17160
Step 25: 17160 + 715 = 17875
Step 26: 17875 + 715 = 18590
Step 27: 18590 + 715 = 19305
Step 28: 19305 + 715 = 20020
Step 29: 20020 + 715 = 20735
Step 30: 20735 + 715 = 21450
Step 31: 21450 + 715 = 22165
Step 32: 22165 + 715 = 22880
Step 33: 22880 + 715 = 23595
Step 34: 23595 + 715 = 24310
Step 35: 24310 + 715 = 25025
Step 36: 25025 + 715 = 25740
Step 37: 25740 + 715 = 26455
Step 38: 26455 + 715 = 27170
Step 39: 27170 + 715 = 27885
Step 40: 27885 + 715 = 28600
Step 41: 28600 + 715 = 29315
Step 42: 29315 + 715 = 30030
Step 43: 30030 + 715 = 30745
Step 44: 30745 + 715 = 31460
Step 45: 31460 + 715 = 32175
Step 46: 32175 + 715 = 32890
Step 47: 32890 + 715 = 33605
Step 48: 33605 + 715 = 34320
Step 49: 34320 + 715 = 35035
Step 50: 35035 + 715 = 35750
Step 51: 35750 + 715 = 36465
Step 52: 36465 + 715 = 37180
Step 53: 37180 + 715 = 37895
Step 54: 37895 + 715 = 38610
Step 55: 38610 + 715 = 39325
Step 56: 39325 + 715 = 40040
Step 57: 40040 + 715 = 40755
Step 58: 40755 + 715 = 41470
Step 59: 41470 + 715 = 42185
Step 60: 42185 + 715 = 42900
Step 61: 42900 + 715 = 43615
Step 62: 43615 + 715 = 44330
Step 63: 44330 + 715 = 45045
Step 64: 45045 + 715 = 45760
Step 65: 45760 + 715 = 46475
Step 66: 46475 + 715 = 47190
Step 67: 47190 + 715 = 47905
Step 68: 47905 + 715 = 48620
Step 69: 48620 + 715 = 49335
Step 70: 49335 + 715 = 50050
Step 71: 50050 + 715 = 50765
Step 72: 50765 + 715 = 51480
Step 73: 51480 + 715 = 52195
Step 74: 52195 + 715 = 52910
Step 75: 52910 + 715 = 53625
Step 76: 53625 + 715 = 54340
Step 77: 54340 + 715 = 55055
Step 78: 55055 + 715 = 55770
Step 79: 55770 + 715 = 56485
Step 80: 56485 + 715 = 57200
Step 81: 57200 + 715 = 57915
Step 82: 57915 + 715 = 58630
Step 83: 58630 + 715 = 59345
Step 84: 59345 + 715 = 60060
Step 85: 60060 + 715 = 60775
Step 86: 60775 + 715 = 61490
Step 87: 61490 + 715 = 62205
Step 88: 62205 + 715 = 62920
Step 89: 62920 + 715 = 63635
Step 90: 63635 + 715 = 64350
Step 91: 64350 + 715 = 65065
Step 92: 65065 + 715 = 65780
Step 93: 65780 + 715 = 66495
Step 94: 66495 + 715 = 67210
Step 95: 67210 + 715 = 67925
Step 96: 67925 + 715 = 68640
Step 97: 68640 + 715 = 69355
Step 98: 69355 + 715 = 70070
Step 99: 70070 + 715 = 70785
Step 100: 70785 + 715 = 71500
Step 101: 71500 + 715 = 72215
Step 102: 72215 + 715 = 72930
Step 103: 72930 + 715 = 73645
Step 104: 73645 + 715 = 74360
Step 105: 74360 + 715 = 75075
Step 106: 75075 + 715 = 75790
Step 107: 75790 + 715 = 76505
Step 108: 76505 + 715 = 77220
Step 109: 77220 + 715 = 77935
Step 110: 77935 + 715 = 78650
Step 111: 78650 + 715 = 79365
Step 112: 79365 + 715 = 80080
Step 113: 80080 + 715 = 80795
Step 114: 80795 + 715 = 81510
Step 115: 81510 + 715 = 82225
Step 116: 82225 + 715 = 82940
Step 117: 82940 + 715 = 83655
Step 118: 83655 + 715 = 84370
Step 119: 84370 + 715 = 85085
Step 120: 85085 + 715 = 85800
Step 121: 85800 + 715 = 86515
Step 122: 86515 + 715 = 87230
Step 123: 87230 + 715 = 87945
Step 124: 87945 + 715 = 88660
Step 125: 88660 + 715 = 89375
Step 126: 89375 + 715 = 90090
Step 127: 90090 + 715 = 90805
Step 128: 90805 + 715 = 91520
Step 129: 91520 + 715 = 92235
Step 130: 92235 + 715 = 92950
Step 131: 92950 + 715 = 93665
Step 132: 93665 + 715 = 94380
Step 133: 94380 + 715 = 95095
Step 134: 95095 + 715 = 95810
Step 135: 95810 + 715 = 96525
Step 136: 96525 + 715 = 97240
Step 137: 97240 + 715 = 97955
Step 138: 97955 + 715 = 98670
Step 139: 98670 + 715 = 99385
Step 140: 99385 + 715 = 100100
Step 141: 100100 + 715 = 100815
Step 142: 100815 + 715 = 101530
Step 143: 101530 + 715 = 102245
Step 144: 102245 + 715 = 102960
Step 145: 102960 + 715 = 103675
Step 146: 103675 + 715 = 104390
Step 147: 104390 + 715 = 105105
Step 148: 105105 + 715 = 105820
Step 149: 105820 + 715 = 106535
Step 150: 106535 + 715 = 107250
Step 151: 107250 + 715 = 107965
Step 152: 107965 + 715 = 108680
Step 153: 108680 + 715 = 109395
Step 154: 109395 + 715 = 110110
Step 155: 110110 + 715 = 110825
Step 156: 110825 + 715 = 111540
Step 157: 111540 + 715 = 112255
Step 158: 112255 + 715 = 112970
Step 159: 112970 + 715 = 113685
Step 160: 113685 + 715 = 114400
Step 161: 114400 + 715 = 115115
Step 162: 115115 + 715 = 115830
Step 163: 115830 + 715 = 116545
Step 164: 116545 + 715 = 117260
Step 165: 117260 + 715 = 117975
Step 166: 117975 + 715 = 118690
Step 167: 118690 + 715 = 119405
Step 168: 119405 + 715 = 120120
Step 169: 120120 + 715 = 120835
Step 170: 120835 + 715 = 121550
Step 171: 121550 + 715 = 122265
Step 172: 122265 + 715 = 122980

So, 715*172 = 122980